题解 | #打印日期#

#include <iostream>
using namespace std;

int main() 
{
    int year,month,day;
    int GetMonthDay[13]={0,31,59,90,120,151,181,212,243,273,304,334,365};//创建一个数组里面存放每个月累计的日期
    while(cin>>year>>day)
    {
        month=0;
        while(day>=GetMonthDay[month])
        {
            ++month;
        }
        day-=GetMonthDay[month-1];
        if(day==0)
        {
            --month;
            day=GetMonthDay[month]-GetMonthDay[month-1];
        }
        if(month>2&&((year%4==0&&year%100!=0)||(year%400==0)))
        {
            --day;
            if(day==0)
            {
                --month;
                day=GetMonthDay[month]-GetMonthDay[month-1]+1;
            }
        }
        printf("%04d-%02d-%02d\n",year,month,day);
    }
    return 0;
}
// 64 位输出请用 printf("%lld")